Improvement in low-water alarms



JOHN STANTON. Improvement in Low-Water'Alarms.

Patented April 25,1871.

fidniidr fields JOHN STANTON, OF PHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 114,216, dated April 25, 1871.

IMPROVEMENT IN LOW-WATER ALARMS.

The Schedule referred to in these Letters Patent and making part of the same.

I, Jenn STANTON, of Philadelphia, Pennsylvania,

have invented an Improved Low-Water Alarm, of

which the following is a specifioation.

Nature and Objectof the Invention.

\ My invention consists of the combination, substantially as described hereafter, of a fusible plug applied to a steam-boiler; a weighted rod adapted to the said plug, and a steam-whistle or other alarm; the whole being so arranged that when the water becomes dangerously low the plug will be melted by the heat of the steam and the alarm will be given by the falling of the weighted rod.

Description of the Aeeompcmymg Drawing. The figure in the accompanying drawing represents in section sufiicient of a boiler and appliances to illustrate my improvement.

General Description.

1, which is inserted into the front of the boiler at a point below whieh it would be dangerous to permit the water to fall.

The plug consists of an alloy which will melt when exposed to the heat of steam, but will remain rigid as long as it is exposed to the less intense heat of the water in the boiler.

In the present instance the fusible plug is fitted into a tube, 1?, screwed into the boiler, the tube being closed at its inner end; but I do not desire to restrict myself to this arrangement, as the fusible plug may be driven directly into the boiler.

,As long as the water remainsabove the plug the latter will serve to retain the weighted arm L in the position shown in the drawing, the'valve of the whistle being consequently-closed; but should the water become so low that the fusible plug is exposed to the action of the steam, it will melt and cease to-support the weighted arm L, which, suddenly falling, will depress the lever L and open the valve of the whistle, thereby giving an alarm to indicate the dangerous position of the boiler.

It is not essential that a whistle should be used as a medium for giving the alarm, as a bell or gong might be struck by thed'alling of the weighted rod.

0' laim.

Witnesses:

LIONEL J. .DEPINEUIL, J OSIIUA Davis. 

